The CART BP pro cuffless device demonstrated acceptable agreement with ABPM for detecting awake-asleep systolic BP changes (mean difference -1.74 mmHg; 95% limits of agreement -14.42 to 10.94).
Observational (n=35)
Does a ring-type cuffless BP device accurately detect awake-asleep BP variations compared to conventional 24-hour ABPM?
The CART BP pro ring-type cuffless device demonstrated strong agreement with conventional ABPM in detecting diurnal BP changes, supporting its potential for continuous 24-hour BP monitoring.
Mean Difference: -1.74 (95% CI -14.42–10.94)
Absolute Event Rate: 13.87% vs 15.61%
p-value: p=<0.01
Objective: We evaluated the accuracy of a ring-type cuffless BP device (CART BP pro) in detecting awake-asleep BP changes compared to conventional 24-hour ambulatory BP monitoring (ABPM), following the validation protocol recommended by the European Society of Hypertension (ESH). Design and method: Among 84 recruited patients, 35 were selected to satisfy ESH recommendations: 30% (n=11) with systolic BP (SBP) >130 mmHg and diastolic BP (DBP) >80 mmHg, and 30% (n=11) with SBP <120 mmHg and DBP <70 mmHg, with the remaining 40% (n=13) included sequentially based on recruitment order. CART BP pro was calibrated at least 24 hours prior to monitoring. Participants simultaneously wore both the CART BP pro and ABPM on the non-dominant arm for 24 hours. Mean SBP/DBP values and awake-asleep BP changes were compared between devices. Results: Awake-asleep SBP/DBP changes were 15.61±8.74 / 11.35±6.22 mmHg (ABPM) and 13.87±9.04 / 11.44±8.62 mmHg (CART BP pro). Differences of mean awake–asleep BP changes were -1.74±6.47 mmHg (SBP) and 0.08±5.84 mmHg (DBP). Correlation was strong for both SBP and DBP changes (r=0.736, p<0.01). Bland–Altman plots showed acceptable agreement with a mean difference and 95% limits of agreement of -1.74 (-14.42, 10.94) mmHg for SBP and 0.08 (-11.37, 11.53) mmHg for DBP. In terms of dipper classification, CART BP pro showed modest agreement with those observed in ABPM. Conclusions: CART BP pro demonstrated strong agreement with ABPM in detecting diurnal BP changes, supporting its potential as a non-invasive, user-friendly device for continuous 24-hour BP monitoring.
Lee et al. (2026) conducted an observational in Blood pressure monitoring (n=35). CART BP pro (ring-type cuffless BP device) vs. 24-hour ambulatory BP monitoring (ABPM) was evaluated on Awake-asleep systolic blood pressure (SBP) changes (MD -1.74, 95% CI -14.42 to 10.94, p=<0.01). The CART BP pro cuffless device demonstrated acceptable agreement with ABPM for detecting awake-asleep systolic BP changes (mean difference -1.74 mmHg; 95% limits of agreement -14.42 to 10.94).